drivers/power/pmu_battery.c

   1 /*
   2  * Battery class driver for Apple PMU
   3  *
   4  *      Copyright © 2006  David Woodhouse <dwmw2@infradead.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/err.h>
  14 #include <linux/power_supply.h>
  15 #include <linux/adb.h>
  16 #include <linux/pmu.h>
  17
  18 static struct pmu_battery_dev {
  19         struct power_supply bat;
  20         struct pmu_battery_info *pbi;
  21         char name[16];
  22         int propval;
  23 } *pbats[PMU_MAX_BATTERIES];
  24
  25 #define to_pmu_battery_dev(x) container_of(x, struct pmu_battery_dev, bat)
  26
  27 /*********************************************************************
  28  *              Power
  29  *********************************************************************/
  30
  31 static int pmu_get_ac_prop(struct power_supply *psy,
  32                            enum power_supply_property psp,
  33                            union power_supply_propval *val)
  34 {
  35         switch (psp) {
  36         case POWER_SUPPLY_PROP_ONLINE:
  37                 val->intval = (!!(pmu_power_flags & PMU_PWR_AC_PRESENT)) ||
  38                               (pmu_battery_count == 0);
  39                 break;
  40         default:
  41                 return -EINVAL;
  42         }
  43
  44         return 0;
  45 }
  46
  47 static enum power_supply_property pmu_ac_props[] = {
  48         POWER_SUPPLY_PROP_ONLINE,
  49 };
  50
  51 static struct power_supply pmu_ac = {
  52         .name = "pmu-ac",
  53         .type = POWER_SUPPLY_TYPE_MAINS,
  54         .properties = pmu_ac_props,
  55         .num_properties = ARRAY_SIZE(pmu_ac_props),
  56         .get_property = pmu_get_ac_prop,
  57 };
  58
  59 /*********************************************************************
  60  *              Battery properties
  61  *********************************************************************/
  62
  63 static char *pmu_batt_types[] = {
  64         "Smart", "Comet", "Hooper", "Unknown"
  65 };
  66
  67 static char *pmu_bat_get_model_name(struct pmu_battery_info *pbi)
  68 {
  69         switch (pbi->flags & PMU_BATT_TYPE_MASK) {
  70         case PMU_BATT_TYPE_SMART:
  71                 return pmu_batt_types[0];
  72         case PMU_BATT_TYPE_COMET:
  73                 return pmu_batt_types[1];
  74         case PMU_BATT_TYPE_HOOPER:
  75                 return pmu_batt_types[2];
  76         default: break;
  77         }
  78         return pmu_batt_types[3];
  79 }
  80
  81 static int pmu_bat_get_property(struct power_supply *psy,
  82                                 enum power_supply_property psp,
  83                                 union power_supply_propval *val)
  84 {
  85         struct pmu_battery_dev *pbat = to_pmu_battery_dev(psy);
  86         struct pmu_battery_info *pbi = pbat->pbi;
  87
  88         switch (psp) {
  89         case POWER_SUPPLY_PROP_STATUS:
  90                 if (pbi->flags & PMU_BATT_CHARGING)
  91                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
  92                 else if (pmu_power_flags & PMU_PWR_AC_PRESENT)
  93                         val->intval = POWER_SUPPLY_STATUS_FULL;
  94                 else
  95                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
  96                 break;
  97         case POWER_SUPPLY_PROP_PRESENT:
  98                 val->intval = !!(pbi->flags & PMU_BATT_PRESENT);
  99                 break;
 100         case POWER_SUPPLY_PROP_MODEL_NAME:
 101                 val->strval = pmu_bat_get_model_name(pbi);
 102                 break;
 103         case POWER_SUPPLY_PROP_ENERGY_AVG:
 104                 val->intval = pbi->charge     * 1000; /* mWh -> µWh */
 105                 break;
 106         case POWER_SUPPLY_PROP_ENERGY_FULL:
 107                 val->intval = pbi->max_charge * 1000; /* mWh -> µWh */
 108                 break;
 109         case POWER_SUPPLY_PROP_CURRENT_AVG:
 110                 val->intval = pbi->amperage   * 1000; /* mA -> µA */
 111                 break;
 112         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
 113                 val->intval = pbi->voltage    * 1000; /* mV -> µV */
 114                 break;
 115         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 116                 val->intval = pbi->time_remaining;
 117                 break;
 118         default:
 119                 return -EINVAL;
 120         }
 121
 122         return 0;
 123 }
 124
 125 static enum power_supply_property pmu_bat_props[] = {
 126         POWER_SUPPLY_PROP_STATUS,
 127         POWER_SUPPLY_PROP_PRESENT,
 128         POWER_SUPPLY_PROP_MODEL_NAME,
 129         POWER_SUPPLY_PROP_ENERGY_AVG,
 130         POWER_SUPPLY_PROP_ENERGY_FULL,
 131         POWER_SUPPLY_PROP_CURRENT_AVG,
 132         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 133         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 134 };
 135
 136 /*********************************************************************
 137  *              Initialisation
 138  *********************************************************************/
 139
 140 static struct platform_device *bat_pdev;
 141
 142 static int __init pmu_bat_init(void)
 143 {
 144         int ret;
 145         int i;
 146
 147         bat_pdev = platform_device_register_simple("pmu-battery",
 148                                                    0, NULL, 0);
 149         if (IS_ERR(bat_pdev)) {
 150                 ret = PTR_ERR(bat_pdev);
 151                 goto pdev_register_failed;
 152         }
 153
 154         ret = power_supply_register(&bat_pdev->dev, &pmu_ac);
 155         if (ret)
 156                 goto ac_register_failed;
 157
 158         for (i = 0; i < pmu_battery_count; i++) {
 159                 struct pmu_battery_dev *pbat = kzalloc(sizeof(*pbat),
 160                                                        GFP_KERNEL);
 161                 if (!pbat)
 162                         break;
 163
 164                 sprintf(pbat->name, "PMU_battery_%d", i);
 165                 pbat->bat.name = pbat->name;
 166                 pbat->bat.properties = pmu_bat_props;
 167                 pbat->bat.num_properties = ARRAY_SIZE(pmu_bat_props);
 168                 pbat->bat.get_property = pmu_bat_get_property;
 169                 pbat->pbi = &pmu_batteries[i];
 170
 171                 ret = power_supply_register(&bat_pdev->dev, &pbat->bat);
 172                 if (ret) {
 173                         kfree(pbat);
 174                         goto battery_register_failed;
 175                 }
 176                 pbats[i] = pbat;
 177         }
 178
 179         goto success;
 180
 181 battery_register_failed:
 182         while (i--) {
 183                 if (!pbats[i])
 184                         continue;
 185                 power_supply_unregister(&pbats[i]->bat);
 186                 kfree(pbats[i]);
 187         }
 188         power_supply_unregister(&pmu_ac);
 189 ac_register_failed:
 190         platform_device_unregister(bat_pdev);
 191 pdev_register_failed:
 192 success:
 193         return ret;
 194 }
 195
 196 static void __exit pmu_bat_exit(void)
 197 {
 198         int i;
 199
 200         for (i = 0; i < PMU_MAX_BATTERIES; i++) {
 201                 if (!pbats[i])
 202                         continue;
 203                 power_supply_unregister(&pbats[i]->bat);
 204                 kfree(pbats[i]);
 205         }
 206         power_supply_unregister(&pmu_ac);
 207         platform_device_unregister(bat_pdev);
 208 }
 209
 210 module_init(pmu_bat_init);
 211 module_exit(pmu_bat_exit);
 212
 213 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 214 MODULE_LICENSE("GPL");
 215 MODULE_DESCRIPTION("PMU battery driver");